Simple User Registration Page and Log-in Page with Database Table in ASP.Net using VB.Net

I already create a simple registration page (E-mail, Password, Confirm Password) and a simple database table (CustomerID, E-mail, Password). I also have a Stored Procedure for checking the table whether the duplicate E-mail addresses exist. But I have issues of my code. The issues will happen when Customer’s information saved to the database table.

1. Please fix my code (not create a new one). When customer fill up the registration page, the information will be saved in the database table. The registration page will also make sure the duplicate E-mail addresses are not saved.

2. Create a Log-in page (log in by using E-mail and Password), and connect to a database table.

3. Write a short page Summary (1. How you fix my code and why. 2. How the Log-in page connect to the database table in detail!!!).

4. Using Visual Basic (NOT C#).